Ruling or draftman&#39;s pen.



7 UNITED STATES Patented June 30, 1903.

JOSEF FIEDLER, OF VIENNA, AUSTRIA-HUNGARY.

RULING OR DRAFTMANS PEN.

SJPEOIFICATION forming part of Letters Patent No. 732,534, dated June30, 1903.

Application filed comers, 1902. Serial No. 125,760; 'NomodelJ ful Rulingor Draftsmans Pen; and I do hereby declare thefollowin g to be a full,clear,

' and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to numerals ofreference marked thereon, which form a part of this specification.

This invention consists in certain improvements in ruling or draftsmenspens having removable point-pieces.

In the annexed drawings, Figures 1 and 2 are views, partly in section,of a ruling-pen with exchangeable poiut-pieces; and Figs. 3 and 4 aredetail views in front elevation and central section, respectively. Figs.5 and 6 are similar views to Figs. 3 and 4, illustrating a modified formof attachment.

WVith reference to the drawings, the legs or nibs 1 and 2 are madeshorter than usual by an amount equivalent to the length of thepoint-pieces to be used, and they preferably terminate in blunt or broadextremities. To the said legs or nibs are interchangeably at tachedpoint-pieces 3 4, which can be constructed in the manner shown in Figs.1 to l-that is to say, their inner or idle ends may be provided with aslot or recess 5, so as to have a fork-like appearance, the object ofsuch slot or recess being to receive the fastening-screws 6 6, which arescrewed into the legs or nibs 1 2. A steady-pin 7 is provided for eachpoint-piece and is preferably arranged on the leg or nib so as to enterinto a corresponding hole provided in the said pointpiece. The latter isremoved by simply loosening the set-screw 6 by the aid of a screw-driver10, which is provided upon the removable handle 9. In the same simpleand easy manner a new point-piece may be attached. .Considering that thecost price of each point-piece is comparatively low, it is preferable toreplace them, when damaged, by new pointpieces, instead of subjectingthe damaged point-pieces to a grinding operation.

Another mode of fastening the point-pieces to the legs or nibs isillustrated in Figs. 5 and 6, in connection with which no tool isrequired in order to attach and detach the point-pieces. In thisinstance the attachment and detachment are effected by pressing andturning the point-pieces in a manner similar to that employed when usingthe so-called bayonetclosing devices. The point-piece 3 is in this casealso provided with a fork-like extremity 5; but the slot thereof iswidened at its inner end into a circular opening. The shank of the bolt6, by which the point-piece is fastened to the nib, is not completelycylindrical; but the cross-section thereof at the part inclosed withinthe fork 5 is flattened on one side, as at 11, (or even on two sides,)by removing about one-half of its thickness, so that the outer ornarrower part of the fork can slide over the bolt-shank in the directionof the face of the flattened side. The fork of the point-piece can onlyslide over the bolt 6 when the point-piece is in one position that is tosay, the position indicated in chainlines in Fig. 5, since it is onlywhen in that position that the width of the fork corresponds to thediminished cross-section of the bolt. When the point-piece is turned inthe direc-' tion shown by the arrow into its workingposition, it will besecured against becoming detached, since the larger diameter of the boltis then arranged transversely to the length of the fork, in the enlargedend thereof.

When in its working position, the point-piece adapted to be receivedbysaid openings, said point-piece and one of the projections beingadapted to interlock to prevent separation of said point-piece from thenib, substantially as described.

2. I11 a ruling-pen, the combination of a nib, a removable point-piecetherefor having openings one of which is in the form of a longitudinalslot bifurcating the butt-end of the point-piece, and projections 011the nib adapted to be received bysaid openings, said point-piece and oneof the projections being adapted to interlock to prevent separation ofsaid point-piece from the nib, substantially as described.

3. I11 a ruling-pen, the combination of a nil), a removable point-piecetherefor, a slot at one end of the point-piece provided with anenlargement at its inner end, a bolt projecting from said niband havinga flattened shank which passes within the said slot in the saidpoint-piece, and a steady-pin for retaining said point-piece inposition, substantially as described.

4. In a ruling-pen, the combination of a nib, a removable point-piecetherefor, aslot in said point-piece provided With an enlargement at itsinner end, a bolt projecting from said nib and having a flattened shankwhich passes within the said slot in the said pointpiece, and asteady-pin for retaining said point-piece in position, substantially asdescribed.

In testimony that I claim the foregoing I have hereunto set my hand this18th day of September, 1902.

JOSEF FIEDLER. \Vitnesses:

ALVESTO S. I-IoGUE, FRANZ REITER.

